在 UWP C# 中从 PixelBuffer 转换为图像（仅使用 Windows.UI.Xaml）

Question

大家好，我想将像素缓冲区转换为图像并进行打印。这是我在我的程序中的信息： PixelBuffer：int 宽度，int 高度，IntPtr 缓冲区，步幅。由于一些装配错误，我无法做到这一点：

Windows.UI.Xaml.Controls.Image image = new Windows.UI.Xaml.Controls.Image();
System.Windows.Media.Imaging.BitmapFrame frame = System.Windows.Media.Imaging.BitmapFrame.Create(System.Windows.Media.Imaging.BitmapSource.Create(
                        (int)pr.pixelBuffer.width,
                        (int)pr.pixelBuffer.height,
                        96,
                        96,
                        System.Windows.Media.PixelFormats.Rgb24,
                        null,
                        pr.pixelBuffer.buffer,
                        (int)(pr.pixelBuffer.stride * pr.pixelBuffer.height),
                        (int)pr.pixelBuffer.stride));
Windows.UI.Xaml.Media.Imaging.BitmapImage bitmapImage = new Windows.UI.Xaml.Media.Imaging.BitmapImage(frame.BaseUri);
image.Source = bitmapImage;//frame;
stackPanel.Children.Add(image)

没有 System.Windowxs.Media.Imaging 有没有办法做到这一点？仅使用 Windows.UI.Xaml ？

谢谢！

Answer 1

I want to convert pixel buffer to image and print it.

我不确定您的像素缓冲区来自什么，因为您的代码只显示从 pr 对象获取。在 uwp 应用程序中如果你从 WriteableBitmap instance, you may not need to get pixel buffer firstly, just set the WriteableBitmap as the source of image. Both BitmapImage 得到它并且 WriteableBitmap 可以作为图像来源，而不仅仅是 BitmapImage.

StorageFile imagefile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/caffe1.jpg"));
WriteableBitmap writeableimage;
using (IRandomAccessStream stream = await imagefile.OpenAsync(FileAccessMode.Read))
{
    SoftwareBitmap softwareBitmap;
    BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);
    softwareBitmap = await decoder.GetSoftwareBitmapAsync();
    writeableimage = new WriteableBitmap(softwareBitmap.PixelWidth, softwareBitmap.PixelHeight);
    writeableimage.SetSource(stream);
}
Windows.UI.Xaml.Controls.Image image = new Windows.UI.Xaml.Controls.Image();
image.Source = writeableimage;
stackPanel.Children.Add(image);

如果不是来自 WriteableBitmap，您可能需要创建一个具有已知宽度、高度的 WriteableBitmap，并将像素数据写入其中。

StorageFile imagefile = await StorageFile.GetFileFromApplicationUriAsync(new Uri("ms-appx:///Assets/caffe2.jpg"));
int width;
int height;
byte[] Inptrbuffer;
using (IRandomAccessStream stream = await imagefile.OpenAsync(FileAccessMode.Read))
{
    SoftwareBitmap softwareBitmap;
    BitmapDecoder decoder = await BitmapDecoder.CreateAsync(stream);
    softwareBitmap = await decoder.GetSoftwareBitmapAsync();
    width = softwareBitmap.PixelWidth;
    height = softwareBitmap.PixelHeight;
    Windows.Graphics.Imaging.PixelDataProvider pixelData = await decoder.GetPixelDataAsync();
    Inptrbuffer = pixelData.DetachPixelData(); 
}
WriteableBitmap newfrompixel=new WriteableBitmap(width,height);
using (Stream stream = newfrompixel.PixelBuffer.AsStream())
{
    await stream.WriteAsync(Inptrbuffer, 0, Inptrbuffer.Length);
} 
Windows.UI.Xaml.Controls.Image image = new Windows.UI.Xaml.Controls.Image(); 
image.Source = newfrompixel; 
stackPanel.Children.Add(image);

如果您需要在展示之前编辑图片，请参考Create, edit, and save bitmap images。

在 UWP C# 中从 PixelBuffer 转换为图像（仅使用 Windows.UI.Xaml）

Converting from PixelBuffer to Image in UWP C# (Using only Windows.UI.Xaml)

c#

buffer

image

pixel

uwp